function OS_Condition(host,active,node)
{
	this.check=function()
	{
		host.error("未被重载的抽象函数");
	}
}

OS_Condition.list=new OS_HashTable();
//取得一类效验器
OS_Condition.getInstance=function(host,active,node)
{
	var tagname=node.nodeName;
	if (!OS_Condition.list.containsKey(tagname)) return null;
	var condition=OS_Condition.list.get(tagname);
	return new condition(host,active,node);
}
